1. According to the color of the fracture:
1. Gray cast iron. Most or all of the carbon in this cast iron exists in the form of free-state flake graphite. Its fracture is dark gray, with certain mechanical properties and good cutting performance. Used in industry.
2. White cast iron White cast iron is an iron-carbon alloy with no or almost no graphite in the structure. Its fracture is bright white, hard and brittle, and cannot be cut. It is rarely used directly in industry to make machinery. Components. Because of its high surface hardness and wear resistance, it is also called chilled cast iron or chilled cast iron.
3. Nozzle cast iron Nozzle cast iron is a kind of cast iron between white cast iron and gray cast iron. Its fracture surface is gray and white with pitted spots. It has poor performance and is rarely used.
2. According to chemical composition:
1. Ordinary cast iron refers to cast iron that does not contain any alloying elements, such as gray cast iron, malleable cast iron, ball milled cast iron, etc.
2. Alloy cast iron is a high-grade cast iron prepared by adding some alloying elements to ordinary cast iron to improve some special properties. Such as various cast irons with special properties of corrosion resistance, heat resistance and wear resistance.